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Heavy physics contributions to neutrinoless double beta decay from QCD
- Source :
- Phys. Rev. Lett. 121, 172501 (2018)
- Publication Year :
- 2018
-
Abstract
- Observation of neutrinoless double beta decay, a lepton number violating process that has been proposed to clarify the nature of neutrino masses, has spawned an enormous world-wide experimental effort. Relating nuclear decay rates to high-energy, beyond the Standard Model (BSM) physics requires detailed knowledge of non-perturbative QCD effects. Using lattice QCD, we compute the necessary matrix elements of short-range operators, which arise due to heavy BSM mediators, that contribute to this decay via the leading order $\pi^- \to \pi^+$ exchange diagrams. Utilizing our result and taking advantage of effective field theory methods will allow for model-independent calculations of the relevant two-nucleon decay, which may then be used as input for nuclear many-body calculations of the relevant experimental decays. Contributions from short-range operators may prove to be equally important to, or even more important than, those from long-range Majorana neutrino exchange.<br />Comment: Published version. Corrected missing term in chiral expansion, added supplemental material, updated references. The Jupyter notebook (DOI:10.5281/zenodo.1243313) accompanying this work can be found on github https://github.com/callat-qcd/project_0vbb
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 121, 172501 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1805.02634
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.121.172501